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Unisource outlines multi‑phase plan to add second transmission line serving Nogales area
Summary
Utility representatives from Unisource and Tucson Electric Power told the council on April 2 that a planned second high‑voltage transmission connection into Santa Cruz County will add redundancy, improve reliability and enable maintenance of constraining equipment on the existing line.
Representatives from Unisource Energy Services and Tucson Electric Power briefed the Nogales City Council on April 2 about the Santa Cruz Reliability North (SCR North) project, a multi‑phase effort to add a second transmission connection into Santa Cruz County and the Nogales area.
Clark Bridal, Unisource manager for siting outreach and engagement, described the problem the project intends to solve: Santa Cruz County and Nogales today rely predominantly on a single transmission path to deliver high‑voltage power into the area. That single path leaves the region vulnerable to long outages and limits the utility’s ability to take equipment out of service for maintenance. Bridal said the SCR North project would establish redundancy so that if one transmission line is out of service, power can flow via the other line with no interruption to customers.
Unisource has divided the work into three…
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